CVE-2023-42722 in SC7731E
Summary
by MITRE • 12/04/2023
In camera service, there is a possible use after free due to a logic error. This could lead to local escalation of privilege with System execution privileges needed
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Analysis
by VulDB Data Team • 12/22/2023
The vulnerability identified as CVE-2023-42722 resides within the camera service component of a mobile operating system, representing a critical logic error that manifests as a use-after-free condition. This flaw occurs when the system attempts to access memory that has already been deallocated, creating a potential pathway for malicious exploitation. The camera service typically operates with elevated privileges to access hardware components and process media data, making it a prime target for privilege escalation attacks. The vulnerability's classification as a use-after-free directly maps to CWE-416, which specifically addresses the use of memory after it has been freed, a common class of memory corruption vulnerabilities that can lead to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple memory corruption, as it provides a potential attack vector for local privilege escalation. An attacker with low-privilege access to the device could exploit this condition to gain system-level privileges, effectively bypassing normal security boundaries. This escalation occurs because the camera service operates with System execution privileges, and the use-after-free condition allows malicious code to manipulate the service's memory state. The attack typically involves crafting specific input or triggering conditions that cause the camera service to free memory while still referencing it, leading to a state where attacker-controlled data can be executed with elevated privileges. This represents a significant security risk as it undermines the fundamental security model of the operating system.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation" and specifically addresses local privilege escalation through software vulnerabilities. The attack surface is particularly concerning because camera services are frequently accessed and often run with high privileges to ensure proper hardware interaction. The exploitation process typically requires the attacker to have some level of local access to the device, either through physical access or through another initial compromise that allows code execution in a low-privilege context. Once the use-after-free condition is triggered, the attacker can potentially overwrite critical function pointers or execute arbitrary code within the camera service's memory space, ultimately gaining system-level control.
Mitigation strategies for CVE-2023-42722 should focus on both immediate patching and defensive programming practices. The primary solution involves applying the vendor-provided security patch that addresses the logic error in the camera service implementation. Additionally, system administrators should implement runtime protections such as address space layout randomization and stack canaries to make exploitation more difficult. The vulnerability highlights the importance of proper memory management practices and input validation within system services that operate with elevated privileges. Organizations should also consider implementing monitoring solutions to detect anomalous behavior in camera service processes and ensure that all system services undergo rigorous code review and security testing. The incident underscores the necessity of following secure coding practices and adhering to security standards that prevent memory corruption vulnerabilities in critical system components.